Page 258 - Demo

256 ISCAR DEEP HOLE DRILLINGExplanation of Brazed Tip Solid Carbide Gundrills DescriptionExample:STGD %u2013 05500 %u2013 0500 %u2013 57 %u2013 IC08GD %u2013 05520 %u2013 0500 %u2013 57 %u2013 E R %u2013 IC908SPGD %u2013 05520 %u2013 0500 %u2013 02051-01 %u2013 IC9081 2 3 4 5 6 71 Designation of the Drilling HeadSTGD %u2013 standard gundrill with brazed tipGD %u2013 semi-standard gundrill with brazed tipSPGD %u2013 special gundrill with brazed tip2 Cutting Diameter (DC)DC3 Drill Lengthdrill length4 For STGD or GD %u2013 code of driver typeFor SPGD %u2013 drawing no.5 Drilling Head Profile According to table 6.11.2.3 6 Finishing Operation P = polishR = rough7 Carbide GradeAvailable carbide grades: IC08, IC908, IC508, IC308, IC208Advantages of the Solid Carbide Gundrill:%u2022 Drilling precision of IT7 to IT9%u2022 Excellent straightness and concentricity%u2022 Maintains high precision hole center alignment%u2022 Surface roughness of 0.4-1.6 Ra is easily obtained%u2022 Reboring operation are often unnecessary